支持中文字母数字、自定义字体php验证码代码

<?php 
/* 
* Captcha Class base on PHP GD Lib 
* @author Design 
* @version 1.0 
* @demo 
* include('captchaClass.php'); 
* $captchaDemo=new Captcha(); 
* $captchaDemo->createImage(); 
*/ 
class Captcha{ 
//@定义验证码图片高度 
private $height; 
//@定义验证码图片宽度 
private $width; 
//@定义验证码字符个数 
private $textNum; 
//@定义验证码字符内容 
private $textContent; 
//@定义字符颜色 
private $fontColor; 
//@定义随机出的文字颜色 
private $randFontColor; 
//@定义字体大小 
private $fontSize; 
//@定义字体 
private $fontFamily; 
//@定义背景颜色 
private $bgColor; 
//@定义随机出的背景颜色 
private $randBgColor; 
//@定义字符语言 
private $textLang; 
//@定义干扰点数量 
private $noisePoint; 
//@定义干扰线数量 
private $noiseLine; 
//@定义是否扭曲 
private $distortion; 
//@定义扭曲图片源 
private $distortionImage; 
//@定义是否有边框 
private $showBorder; 
//@定义验证码图片源 
private $image; //@Constructor 构造函数 
public function Captcha(){ 
$this->textNum=4; 
$this->fontSize=16; 
$this->fontFamily='c:\windows\fontsSIMYOU.ttf';//设置中文字体，可以改成linux的目录 
$this->textLang='en'; 
$this->noisePoint=30; 
$this->noiseLine=3; 
$this->distortion=false; 
$this->showBorder=false; 
} 

//@设置图片宽度 
public function setWidth($w){ 
$this->width=$w; 
} 
//@设置图片高度 
public function setHeight($h){ 
$this->height=$h; 
} 
//@设置字符个数 
public function setTextNumber($textN){ 
$this->textNum=$textN; 
} 
//@设置字符颜色 
public function setFontColor($fc){ 
$this->fontColor=sscanf($fc,'#%2x%2x%2x'); 
} 
//@设置字号 
public function setFontSize($n){ 
$this->fontSize=$n; 
} 
//@设置字体 
public function setFontFamily($ffUrl){ 
$this->fontFamily=$ffUrl; 
} 
//@设置字符语言 
public function setTextLang($lang){ 
$this->textLang=$lang; 
} 
//@设置图片背景 
public function setBgColor($bc){ 
$this->bgColor=sscanf($bc,'#%2x%2x%2x'); 
} 
//@设置干扰点数量 
public function setNoisePoint($n){ 
$this->noisePoint=$n; 
} 
//@设置干扰线数量 
public function setNoiseLine($n){ 
$this->noiseLine=$n; 
} 
//@设置是否扭曲 
public function setDistortion($b){ 
$this->distortion=$b; 
} 
//@设置是否显示边框 
public function setShowBorder($border){ 
$this->showBorder=$border; 
} 
//@初始化验证码图片 
public function initImage(){ 
if(empty($this->width)){$this->width=floor($this->fontSize*1.3)*$this->textNum+10;} 
if(empty($this->height)){$this->height=$this->fontSize*2;} 
$this->image=imagecreatetruecolor($this->width,$this->height); 
if(empty($this->bgColor)){ 
$this->randBgColor=imagecolorallocate($this->image,mt_rand(100,255),mt_rand(100,255),mt_rand(100,255)); 
}else{ 
$this->randBgColor=imagecolorallocate($this->image,$this->bgColor[0],$this->bgColor[1],$this->bgColor[2]); 
} 
imagefill($this->image,0,0,$this->randBgColor); 
} 
//@产生随机字符 
public function randText($type){ 
$string=''; 
switch($type){ 
case 'en': 
$str='ABCDEFGHJKLMNPQRSTUVWXY3456789'; 
for($i=0;$i<$this->textNum;$i++){ 
$string=$string.','.$str[mt_rand(0,29)]; 
} 
break; 
case 'cn': 
for($i=0;$i<$this->textNum;$i++) { 
$string=$string.','.chr(rand(0xB0,0xCC)).chr(rand(0xA1,0xBB)); 
} 
$string=iconv('GB2312','UTF-8',$string); //转换编码到utf8 
break; 
} 
return substr($string,1); 
} 
//@输出文字到验证码 
public function createText(){ 
$textArray=explode(',',$this->randText($this->textLang)); 
$this->textContent=join('',$textArray); 
if(empty($this->fontColor)){ 
$this->randFontColor=imagecolorallocate($this->image,mt_rand(0,100),mt_rand(0,100),mt_rand(0,100)); 
}else{ 
$this->randFontColor=imagecolorallocate($this->image,$this->fontColor[0],$this->fontColor[1],$this->fontColor[2]); 
} 
for($i=0;$i<$this->textNum;$i++){ 
$angle=mt_rand(-1,1)*mt_rand(1,20); 
imagettftext($this->image,$this->fontSize,$angle,5+$i*floor($this->fontSize*1.3),floor($this->height*0.75),$this->randFontColor,$this->fontFamily,$textArray[$i]); 
} 
} 
//@生成干扰点 
public function createNoisePoint(){ 
for($i=0;$i<$this->noisePoint;$i++){ 
$pointColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),mt_rand(0,255)); 
imagesetpixel($this->image,mt_rand(0,$this->width),mt_rand(0,$this->height),$pointColor); 
} 
} 
//@产生干扰线 
public function createNoiseLine(){ 
for($i=0;$i<$this->noiseLine;$i++) { 
$lineColor=imagecolorallocate($this->image,mt_rand(0,255),mt_rand(0,255),20); 
imageline($this->image,0,mt_rand(0,$this->width),$this->width,mt_rand(0,$this->height),$lineColor); 
} 
} 
//@扭曲文字 
public function distortionText(){ 
$this->distortionImage=imagecreatetruecolor($this->width,$this->height); 
imagefill($this->distortionImage,0,0,$this->randBgColor); 
for($x=0;$x<$this->width;$x++){ 
for($y=0;$y<$this->height;$y++){ 
$rgbColor=imagecolorat($this->image,$x,$y); 
imagesetpixel($this->distortionImage,(int)($x+sin($y/$this->height*2*M_PI-M_PI*0.5)*3),$y,$rgbColor); 
} 
} 
$this->image=$this->distortionImage; 
} 
//@生成验证码图片 
public function createImage(){ 
$this->initImage(); //创建基本图片 
$this->createText(); //输出验证码字符 
if($this->distortion){$this->distortionText();} //扭曲文字 
$this->createNoisePoint(); //产生干扰点 
$this->createNoiseLine(); //产生干扰线 
if($this->showBorder){imagerectangle($this->image,0,0,$this->width-1,$this->height-1,$this->randFontColor);} //添加边框 
imagepng($this->image); 
imagedestroy($this->image); 
if($this->distortion){imagedestroy($this->$distortionImage);} 
return $this->textContent; 
} 
} 
?>使用方法： 
<?php 
//session_start(); 
header("Content-type:image/png"); 
include('captcha5_class.php'); 
$captcha5=new Captcha(); 
//@设置验证码宽度 
//$captcha5->setWidth(200); 
//@设置验证码高度 
//$captcha5->setHeight(50); 
//@设置字符个数 
$captcha5->setTextNumber(5); 
//@设置字符颜色 
//$captcha5->setFontColor('#ff9900'); 
//@设置字号大小 
//$captcha5->setFontSize(25); 
//@设置字体 
$captcha5->setFontFamily('c:\windows\fonts\STXINGKA.TTF'); 
//@设置语言 
$captcha5->setTextLang('cn'); 
//@设置背景颜色 
//$captcha5->setBgColor('#000000'); 
//@设置干扰点数量 
//$captcha5->setNoisePoint(600); 
//@设置干扰线数量 
//$captcha5->setNoiseLine(10); 
//@设置是否扭曲 
//$captcha5->setDistortion(true); 
//@设置是否显示边框 
$captcha5->setShowBorder(true); 
//输出验证码 
$code=$captcha5->createImage(); 
//$_SESSION['captchaCode']['content']=$code; 
//$_SESSION['captchaCode']['time']=microtime(); 
?>